Problems with spam on Gmail or Hotmail

Do you have problems to deliver mails to Gmail or Hotmail?
I had some issues in last few months and at the beginning I was not able to solve the problem, because all the setting appears to be correct and I was not blacklisted (yes, I know that Google and Hotmail use their blacklist).
The question was how to reach the administrators on the destination side. To do this, just follow this links:
For Gmail: http://www.rackaid.com/resources/gmail-blacklist-removal/
For Hotmail: http://www.rackaid.com/resources/hotmail-blacklist-removal/
Here you will find a lot of information and the ticket to request the support.
PS: Maybe it is not a bad idea to check your status before you send the ticket. You can do it here: https://www.senderscore.org .